LogFAQs > #914306023

Make sure to get to rank 7 with the Fortune girl ASAP. You get the ability to pay to boost friendship with a confidant without using up time, so you never have to spend time with a confidant unless it levels them up.

Hang out with the Death arcana doctor to get SP-recovery items and accessories that will allow you to finish Palaces in one day (unless the story requires multiple days).

Temperance Rank 10 lets you occasionally skip class to do other tasks, so focus that one as well.

I believe it's no longer possible to level up the Sun confidant after November, so get him done before then.

Make sure to get the social stat-boosting juice every Sunday at the underground walkway area. Using money instead of time to boost stats is a better investment.

Make sure to always have a book on you. On certain days you can read on the train, and books can either help you boost stats or unlock new hang-out spots.

Make sure to get any questions in class right, even if you have to reset if you mess up. Don't squander opportunities to boost social stats.

Haven't played since the game came out, but this is what I remember.